WM8955BL

Production Data

w

PD Rev 4.1 February 2007

10

POWER CONSUMPTION

The power consumption of the WM8955BL depends on the following factors.

•

Supply voltages: Reducing the supply voltages also reduces supply currents, and therefore results in significant power

savings.

•

Operating mode: Power consumption is lower in mono modes than in stereo, as one DAC is switched OFF. Unused

analogue outputs should be switched off.

Control Register

R24 R23 R38 R43

Other settings

Tot. Power

Bit

V

I (mA)

V

I (mA)

V

I (mA)

V

I (mA)

(mW)

OFF

00

0

00

000000

0

11

0

0

Clocks stopped

3.3

0.0001

3.3

0.0103

3.3

0

3.3

0

0.03432

01

0

0

2.5

0.0001

2.5

0.0084

2.5

0

2.5

0

0.02125

00

0

0

1.8

0.0001

1.5

0.0067

1.8

0

1.8

0

0.01023

Low-power standby (LPS)

10

1

0

0

000000

0

11

0

0

3.3

0.2339

3.3

0.409

3.3

0.0856

3.3

0

2.40405

using 500 KOhm VMID string

01

0

0

2.5

0.1737

2.5

0.2556

2.5

0.0616

2.5

0

1.22725

00

0

0

1.8

0.1208

1.5

0.1416

1.8

0.042

1.8

0

0.50544

Playback to Line-out

01

1

1

1

001100

0

11

0

0

3.3

3.9903

3.3

5.1104

3.3

0.0878

3.3

0.6621

32.50698

01

0

0

2.5

2.9459

2.5

3.5193

2.5

0.0632

2.5

0.6553

17.95925

00

0

0

1.8

2.0701

1.5

1.9742

1.8

0.0432

1.8

0.3845

7.45734

Playback to Line-out

01

1

1

1

001100

1

11

0

0

3.3

3.7821

3.3

4.2678

3.3

0.0879

3.3

0.6619

29.03901

(64x oversampling mode)

01

0

0

2.5

2.7924

2.5

2.9224

2.5

0.0632

2.5

0.6557

16.08425

00

0

0

1.8

1.9604

1.5

1.6299

1.8

0.0432

1.8

0.3847

6.74379

Playback

01

1

1

1

110000

0

11

0

0

3.3

3.9623

3.3

5.0846

3.3

0.0878

3.3

0.6913

32.4258

to 16 Ohm headphone

01

0

0

2.5

2.946

2.5

3.5187

2.5

0.0632

2.5

0.6691

17.9925

using caps on HPOUTL/R

00

0

0

1.8

2.0702

1.5

1.9742

1.8

0.04332

1.8

0.3852

7.458996

Playback

01

1

1

1

110001

0

11

0

0

R24, OUT3SW=00

3.3

4.0662

3.3

5.1007

3.3

0.0881

3.3

1.172

34.4091

to 16 Ohm headphone

01

0

0

2.5

2.999

2.5

3.557

2.5

0.064

2.5

1.167

19.4675

capless mode using OUT3

00

0

0

1.8

2.0705

1.5

1.9164

1.8

0.04272

1.8

0.914

8.8857

Headphone Amp

01

1

0

0

110000

0

11

0

0

Clocks stopped

3.3

1.7135

3.3

0.0901

3.3

0

3.3

0.6624

8.1378

line-in to 16 Ohm h/phone

01

0

0

2.5

1.211

2.5

0.009

2.5

0

2.5

0.6291

4.62275

00

0

0

1.8

0.8017

1.5

0.0071

1.8

0

1.8

0.3869

2.15013

Phone Call

01

1

0

0

110011

0

11

1

0

Clocks stopped

3.3

1.9574

3.3

0.0905

3.3

0

3.3

1.1675

10.61082

diff. mono line-in to h/phone,

01

1

0

2.5

1.4258

2.5

0.009

2.5

0

2.5

1.1017

6.34125

diff. mono line-out to TX

00

1

0

1.8

0.9076

1.5

0.0071

1.8

0

1.8

0.6576

2.82801

PLL only

00

0

00

000000

0

11

0

1

3.3

0.5389

3.3

0.4966

3.3

0.0855

3.3

0

3.6993

01

0

1

2.5

0.4554

2.5

0.2774

2.5

0.0616

2.5

0

1.986

00

0

1

1.8

0.4034

1.5

0.145

1.8

0.04188

1.8

0

1.019004

DBVDD

HPVDD

R25

R26 (1Ah)

AVDD

DCVDD

Table 1 Supply Current Consumption

Notes:

1.

2.

All figures are quiescent, with no signal.

3.

The power dissipated in the headphone itself is not included in the above table.